/*
* Copyright 2012-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.actuate.endpoint;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.apache.catalina.Container;
import org.apache.catalina.Context;
import org.apache.catalina.Manager;
import org.apache.catalina.session.ManagerBase;
import org.springframework.beans.BeansException;
import org.springframework.boot.actuate.metrics.Metric;
import org.springframework.boot.web.embedded.tomcat.TomcatWebServer;
import org.springframework.boot.web.server.WebServer;
import org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
/**
* A {@link PublicMetrics} implementation that provides Tomcat statistics.
*
* @author Johannes Edmeier
* @author Phillip Webb
* @since 1.2.0
*/
public class TomcatPublicMetrics implements PublicMetrics, ApplicationContextAware {
private ApplicationContext applicationContext;
@Override
public Collection<Metric<?>> metrics() {
if (this.applicationContext instanceof ServletWebServerApplicationContext) {
Manager manager = getManager(
(ServletWebServerApplicationContext) this.applicationContext);
if (manager != null) {
return metrics(manager);
}
}
return Collections.emptySet();
}
private Manager getManager(ServletWebServerApplicationContext applicationContext) {
WebServer webServer = applicationContext.getWebServer();
if (webServer instanceof TomcatWebServer) {
return getManager((TomcatWebServer) webServer);
}
return null;
}
private Manager getManager(TomcatWebServer webServer) {
for (Container container : webServer.getTomcat().getHost()
.findChildren()) {
if (container instanceof Context) {
return ((Context) container).getManager();
}
}
return null;
}
private Collection<Metric<?>> metrics(Manager manager) {
List<Metric<?>> metrics = new ArrayList<>(2);
if (manager instanceof ManagerBase) {
addMetric(metrics, "httpsessions.max",
((ManagerBase) manager).getMaxActiveSessions());
}
addMetric(metrics, "httpsessions.active", manager.getActiveSessions());
return metrics;
}
private void addMetric(List<Metric<?>> metrics, String name, Integer value) {
metrics.add(new Metric<>(name, value));
}
@Override
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
this.applicationContext = applicationContext;
}
}